Colin's classmate's comment about "his people" being good at science is an example of:

The comment made by Colin's classmate about "his people" being good at science reflects a microaggression because it embodies a subtle, often unintentional, form of prejudice. Microaggressions are typically brief, everyday comments or behaviors that convey derogatory or negative messages to marginalized groups. In this case, the remark reduces an individual’s identity to a stereotype about a larger group, suggesting that all members of that group share certain qualities or abilities, in this case, proficiency in science.

This type of comment can perpetuate existing stereotypes without direct malice, often leaving the recipient feeling uncomfortable or marginalized. It highlights an underlying bias rather than outright discrimination or overt racism. Understanding microaggressions is important for fostering a more inclusive environment, as they can accumulate and significantly impact individuals from the targeted groups.